Paint for preventing surface reflection

Inactive Publication Date: 2009-09-24
KK TOPCON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]It is an object of the present invention to provide a paint that can control the reflectance to be 1% or less, independently of the material of the substrate, without needing

Problems solved by technology

In general, cameras are usually subjected to antireflection treatment applied to their inner wall surfaces, because incident light from lenses reflected at the inner wall surfaces exposes a film during photographing to generate halations or ghosts, or because light from a light source reflects at the camera inner wall

Method used

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  • Paint for preventing surface reflection
  • Paint for preventing surface reflection

Examples

Experimental program
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Effect test

example 1

[0033]A black paint is prepared by mixing an additive in a ratio of 5 parts by weight or more, preferably 6 parts by weight or more, more preferably 7 parts by weight or more, with a solution, in a ratio of 100 parts by weight, having dissolved therein an acrylic resin that is a base and agitating. A dip coating method is preferably used as a method of applying a black paint. However, the method is not limited thereto and its examples that are good include wet methods such as a dipping method, a spin coating method and a bar coating method (solution coating methods) and a brush painting method.

example 2

[0034]A black paint is prepared by mixing an additive in a ratio of 5 parts by weight or more, preferably 6 parts by weight or more, more preferably 7 parts by weight or more, with a solution, in a ratio of 100 parts by weight, having dissolved therein a modified vinyl acetate resin that is a base and agitating. A dip coating method is preferably used as a method of applying a black paint. However, the method is not limited thereto and its examples that are good include wet methods (solution coating methods) such as a dipping method, a spin coating method and a bar coating method and a brush painting method.

example 3

[0035]A black paint is prepared by mixing an additive in a ratio of 5 parts by weight or more, preferably 6 parts by weight or more, more preferably 7 parts by weight or more, with a solution, in a ratio of 100 parts by weight, having dissolved therein a specific alkyd-melamine resin that is a base and agitating. A dip coating method is preferably used as a method of applying a black paint. However, the method is not limited thereto and its examples that are good include wet methods (solution coating methods) such as a dipping method, a spin coating method and a bar coating method and a brush painting method.

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Abstract

The surface reflection is prevented by application of a black paint to an element such as a unit or parts forming an optical system, in particular an inner face of a camera lens tube portion and the end face portion of a lens, or the like. Application of the black paint to the element leads to the formation of a black coating film of from 0.35% to 0.7% that is an extremely low reflectance onto a surface of the element in a wide-ranging wavelength region from 380 nm to 780 nm, regardless of the material thereof.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a paint for preventing reflections from a surface of an element such as a camera lens unit and parts, and a method of preventing their surface reflections, and particularly relates to use of a paint for preventing surface reflections of such an element.RELATED ART[0002]In general, cameras are usually subjected to antireflection treatment applied to their inner wall surfaces, because incident light from lenses reflected at the inner wall surfaces exposes a film during photographing to generate halations or ghosts, or because light from a light source reflects at the camera inner wall surfaces to inject into the finder light path and thereby to cause the field of view image of the finder to be difficult to see in some cases.[0003]A technique is conventionally known as a antireflection treatment that includes immersing the surface of the inner wall of a lens barrel, for example, in a solution of a fluorocarbon resin (e.g., th...

Claims

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Application Information

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IPC IPC(8): B32B27/30B32B27/32B32B27/40C09D113/00C09D161/28
CPCG02B1/111G02B5/223G02B5/003Y10T428/31504Y10T428/31547Y10T428/31855C09D5/00
Inventor KOJIMA, TATSUYAOKUBO, TAKUROTAKAHASHI, TAKASHI
Owner KK TOPCON
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